ruby: hash to query string

gistfile1.rb

def get_query_string(query_hash)
  query_array = []

  query_hash.each{|key, val| val ? query_array.push([key, val].join('=')) : nil}
  query_string = query_array != [] ? query_array.join('&') : ''
end

query_hash = {"a"=> 1, "c" =>nil,  "b"=>3}
p get_query_string(query_hash)

# "a=1&b=3"